feat(deck): 부트 흐름 변경 — 시작→MainMenu→로비→(run NPC)→charselect

- OnBeginPlay: ShowLobby → ShowMainMenu (최초 화면을 메인메뉴로)
- MainMenu NewGameButton: ShowCharacterSelect → ShowLobby (시작→로비맵+LobbyUIGroup)
- 로비 run NPC(OnLobbyNpcInteract id=="run")→ShowCharacterSelect는 기존 유지

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tools/deck/cb/boot.mjs

@@ -10,7 +10,7 @@ ${luaCharsTable()}
 ${luaSoulShopTable(SOUL_UNLOCKS)}
 self.SoulUnlocks = {}
 self.SoulPoints = self.SoulPoints or 0
-self:ShowLobby()
+self:ShowMainMenu()
 local lp = _UserService.LocalPlayer
 if lp ~= nil then
 	self:ReqLoadAscension(lp.PlayerComponent.UserId)